FKIE_CVE-2021-43808

Vulnerability from fkie_nvd - Published: 2021-12-08 00:15 - Updated: 2026-06-17 04:11
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request.
References
security-advisories@github.comhttps://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9bPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/pull/39906Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/pull/39908Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/pull/39909Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/releases/tag/v6.20.42Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/releases/tag/v7.30.6Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/releases/tag/v8.75.0Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfwExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9bPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/pull/39906Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/pull/39908Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/pull/39909Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/releases/tag/v6.20.42Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/releases/tag/v7.30.6Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/releases/tag/v8.75.0Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfwExploit, Third Party Advisory
Impacted products
Vendor Product Version
laravel framework *
laravel framework *
laravel framework *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "framework",
          "vendor": "laravel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 8.0.0, \u003c 8.75.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0, \u003c 7.30.6"
            },
            {
              "status": "affected",
              "version": "\u003c 6.20.42"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "008F1411-5AC5-4BB3-9BB4-C873D9D4CB2C",
              "versionEndExcluding": "6.20.42",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6B26BF29-BEB7-44FF-A39F-A103C30B0726",
              "versionEndExcluding": "7.30.6",
              "versionStartIncluding": "7.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "15E8F817-7A3D-40D4-9DCB-FBC8FD7CE3F7",
              "versionEndExcluding": "8.75.0",
              "versionStartIncluding": "8.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request."
    },
    {
      "lang": "es",
      "value": "Laravel es un framework de aplicaciones web. Laravel versiones anteriores a 8.75.0, 7.30.6 y 6.20.42, contiene una posible vulnerabilidad de tipo cross-site scripting (XSS) en el motor de plantillas Blade. Puede hacerse clic en un elemento HTML roto y llevar al usuario a otra ubicaci\u00f3n en su navegador debido a un ataque de tipo XSS. Esto es debido a que el usuario puede adivinar el hash SHA-1 del marcador de posici\u00f3n padre al probar los nombres comunes de las secciones. Si la plantilla padre contiene una estructura HTML explotable puede exponerse una vulnerabilidad de tipo XSS. Esta vulnerabilidad ha sido parcheada en las versiones 8.75.0, 7.30.6 y 6.20.42 determinando el marcador de posici\u00f3n padre en tiempo de ejecuci\u00f3n y usando un hash aleatorio que es \u00fanico para cada petici\u00f3n"
    }
  ],
  "id": "CVE-2021-43808",
  "lastModified": "2026-06-17T04:11:28.820",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-12-08T00:15:07.683",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
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      ],
      "url": "https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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